It is now 10 years since this book was published. Surprisingly, it is still cited positively, especially by some evolutionary psychologists, along with citations of the Baker and Bellis papers in "Animal Behaviour", published in the 1990's. I say "surprisingly" because , in the intervening years, a substantial number of publications has appeared which fail to support many of the conclusions reached by Baker and Bellis concerning human sperm competition."Khamikaze sperm" , for example , don't exist in human beings...or at least Moore et al found no evidence to support the view that some human sperm block or interfere with those of other males( the paper was published in the Proceedings of the Royal Society of London, Series B...which has stringent reviewing standards). The is no evidence that men with larger testes are more likely to engage in extra-pair copulations ( Simmons et al published a very good study on this in Animal Behaviour in 2004). As for female orgasm , and Baker And Bellis bizarre views on its functions...I recommend Elizabeth Lloyd's book on this topic, as a much needed critique of theories for the evolution of orgasm in women. As a primatologist I could never reconcile the animal evidence with Baker and Bellis ideas either. Over the years reputable experts in the field of sperm competition....such as Birkhead, Gomendio and Roldan, Harcourt, and Short , have pointed out the deficiencies in Baker and Bellis work.
Yet it is still cited, and has entered the textbooks in some cases....presumably to the detriment of students who are exposed to this material as if it represented the established facts of human physiology. A number of evolutionary psychologists are particularly at fault in this respect.The history of science teaches that truth always emerges in the end. Such is the case with human sperm competition....no doubt it occurs, but how often and whether it has shaped human evolution still needs clarification.The reader will not find reliable answers to these questions in Baker and Bellis book.
Alan Dixson D.Sc.